Carburetor maintenance kits for Gen 1

[dueruote]

HI all, I'm looking to find a good quality maintenance kit for the carburetors. I'm talking only about the floater valves, o-rings, etc.
OEM parts are prohibitively expensive, but on the other hand I want to avoid cheap Chinese knock offs like from AliExpress and others.
Any suggestions ?

[Mark YPVS]

I think tourmax are one of the better ones if they do them ( sure they are OEM quality), Allens carbs but they are slow ( 2 years still waiting for a DT carb) i personally would avoid Keyster kits , they get bad press on LC forums etc.


or Fowlers Yamaha?


Mark 

[unfazed]

Check the downloads section  I uploaded  the sizes and type or O ring to use there.  I just uploaded Information on the float bowl seals

[PieEater]

O ring sizes are in the Gen1 FAQ.


/Edit: Added info on float bowl seals - Thanks unfazed for the info  :kiss

[dueruote]

Thanks for the tips.

What about the needle valve and seat ?
Do these also tend to wear or it's just the o-rings that seal it ?

[old son]

Try Megazip.net

They sell genuine Yamaha bits at a very much reduced price. Worth taking a look at their website. You need to allow for Customs Tax but still much cheaper, I saved 60% on an ignition switch.

[Falcon 269]

Thanks for the tips.

What about the needle valve and seat ?
Do these also tend to wear or it's just the o-rings that seal it ?

It's usually just the O-rings that fail.


In my experience, none of the aftermarket needle valve kits work as well as the OE parts.  Then tend to have different needle spring tension which affects the float level, which is important if your carbs have been 'Ivanized'.

[dueruote]

Yeah, I've Ivanized it 5 years ago, and at the time didn't change any of the o'rings.

[Trebus]

Recently changed my o-rings.

Started with low end misfire. Carbs have Ivan’s kit and have always been a bit lazy with not changing down, easily accelerated from 30mph in top. But began bogging down towards the end of last year.

Seems to have cured it. Carbs were spotless internally so ruling out any other fuelling reason for poor running.

[maxzer1500]

What I do with my carb bikes when genuine or tourmax kits (yes they are good) are not available is to buy the keyster kit to only use the gaskets and ‘o’ rings with tourmax float needle valves which mostly are. Admittedly it’s a bit of a process sometimes as the eBay search functions are crap (they seem more interested in f ing around with the layout) . I know it might seem like throwing money away, but what’s the alternative if you want/need to carry on riding without losing bike value? Also, though the job doesn’t want to be repeated, only do the offending carb perhaps. Leave well alone  that which is working ok. All the best.

[unfazed]

Buy the O-Rings you need here:  https://www.polymax.co.uk/o-rings/rubber-viton-oring/
Sizes you need are here:  https://foc-u.co.uk/index.php?action=dow...file&id=93

[Trebus]

Buy the O-Rings you need here:  https://www.polymax.co.uk/o-rings/rubber-viton-oring/
Sizes you need are here:  https://foc-u.co.uk/index.php?action=dow...file&id=93

Absolutely this ?

[dueruote]

Thanks all for the replies.

By the way, could there be any chance that a leaking floater valve or o-ring could let fuel flood the carburetors and pass on to the cylinders and end up mixed with the engine oil ?

[tnfazer]

I dont think so, my experience is that fuel starts leaking copiously out of the carbs first. They literally flood so you'll notice if the o-rings are gone.


A tip I got from my mechanic then was that Suzuki Bandit 1200 has the same o-rings that were at least then much cheaper and withstood ethanol mixed into gasoline better than the old originals. (Just to be safe I have also used fuel stabilizer during winter storage ever since).

[dueruote]

... and withstood ethanol mixed into gasoline better than the old originals.

This is a good point. I don't know if it has been addressed before in another topic.
Doing a quick google search it seems Viton o'rings are more resistant to ethanol than NBR, so that's what I'll look for.

[RMT1983]

Buy the O-Rings you need here:  https://www.polymax.co.uk/o-rings/rubber-viton-oring/
Sizes you need are here:  https://foc-u.co.uk/index.php?action=dow...file&id=93

Has anyone worked out which air mixture orings actually fit?


Thanks